Collection request metrics for external services using Stackdriver

Hello All! I have multiple hosts e.g.:

- .myhost.com
- .myhost.io
- .myhost.net

related to one external service.

So, is it possible to collect request metrics (count, response codes and etc.) from service deployed in GKE where mesh controlled by Istio and visualize them in GCP Stackdriver?

If yes, could you please point me to documentation or workable example?

Thank you in advance!